#include<bits/stdc++.h>
using namespace std;
const int N=1145141;
int a[N],dfn[N],low[N],cut[N],he[N],ne[N],ve[N],br[N];
int m,n,tot,t;
void add(int x,int y)
{
	ve[++tot]=y,ne[tot]=he[x],he[x]=tot;
}
void tar(int x,int dad){
	dfn[x]=low[x]=++t;
	for(int i=he[x];i;i=ne[i]){
		int y=ve[i];
	//	cout<<y<<endl;
		if(y==0)continue;
		if(!dfn[y]){
			tar(y,x);
			low[x]=min(low[x],low[y]);
			
		//	cout<<x<<" "<<y<<" "<<dfn[x]<<" "<<low[y]<<endl;
			if(dfn[x]<low[y]){
				br[i]=br[i^1]=1;
		//	cout<<i<<endl;
			}
		}
		else if(y!=dad){//if(x==2)cout<<low[x]<<endl;
			low[x]=min(low[x],dfn[y]);
		}
	}
}
int main(){
cin>>n>>m;
		if(m==0&&n==0)break;
		memset(dfn,0,sizeof(dfn));
		memset(low,0,sizeof(low));
		memset(br,0,sizeof(br));
		memset(he,0,sizeof(he));
		memset(ne,0,sizeof(ne));
		memset(ve,0,sizeof(ve));
		int x,y;
		for(int i=1;i<=m;i++){
			cin>>x>>y;
			add(x,y);
			add(y,x);
		}
		for(int i=1;i<=n;i++){
			if(!dfn[i]){
				tar(i,i);
			//	cout<<i<<endl;
			}
		}
		int ans=0;
		for(int i=1;i<=n;i++){
			for(int j=he[i];j;j=ne[j]){
				if(br[j])ans++;
			}
		}
		cout<<(ans+1)/2<<endl;
	
	return 0;
}

answer.code: In function ‘int main()’:
answer.code:33:31: error: break statement not within loop or switch
   33 |                 if(m==0&&n==0)break;
      |                               ^~~~~